Toothbrush



FIG. 1 is a perspective view from the front and one side;

FIG. 2 is a front view;

FIG. 3 is a side view;

FIG. 4 is a back view;

FIG. 5 is a plan view; and,

FIG. 6 is an underneath plan view.

I claim the ornamental design for a toothbrush, as shown and described.